Electroinertia brake



Jan, 2s, 1947. L. EJOHNSQN 2,414,879

ELECTRO- INERT IA BRAKE Filed Fab.' 1, 1944 2 .sheets-sheet 1 f IN V EN TOR.

ATTORNEYS Jan. 28, 1947. L E JQHNSON 2,414,879

ELECTRO- INERTIA BRAKE Filed Feb. 1, 1944 2 Sheets-Sheet 2 Af /0 i 24 ZQZJZ'JE L/E 2250 72,

IN VEN TOR.

ATTDRN EYE 'myw ` PatentedyJan. 28, 1947 UNITED STATES PATENT OFFICE Louisv E. Johnson, Huntsville, Ala. Applieetien February 1, i944, serial' Nia-520,654

4 Claims. (Cl. 188-182) The invention relates to vehicle brakes, and more especially to electro-inertia: brakes for motor vehicles.

The primary object of the invention is the provision of a brake of this character, wherein the wheel of a vehicle will be caused to slow down to its threshold of skidding, but not to effect skidding, and in this manner A maximum braking power is arrived at, and thus stop the vehicle in motion.

Another object of the invention is the provision of a brake of this character, wherein the mechaf nism i`s an adjunct oi?v each wheel of the vehicle,`

and the braking power of each is proportionately to braking effect without causing skidding, and

making it impossible for the vehicle to turn when the brakes are applied to the respective wheels at high speed.

A further object of the invention is the provil sion of a brake` of this character, wherein the,

construction andarrangement thereof are novel and unique, it being effective for increased braking power, and is easy in operation.

A still further object of the invention is the provision of a brake of this character, wherein the same is a part of the hydraulic braking setup in a motor vehicle, and assures quick braking action, without liability of skidding or the locking of the brakes, in the use thereof.

A still further object of the invention is the provision of a brake of this character, which is simple in construction, thoroughly reliable and efficient in operation, strong, durable, and inexpensive to manufacture and install.

With these and other objects in view the invention consists in the features of construction, combination and arrangement of parts as will bel hereinafter more fully describedfillustrated in the accompanying drawings, which disclose'the preferred embodiment of the invention, and pointed out in the claims hereunto appended.

In the accompanying drawings:

Figure 1 is a fragmentary sectional and diagrammatic view of the brake constructed in ac-. cordance with the invention. l

Figure 2 is a vertical cross sectional View through the brake drumI with the invention applied.

Figure 3 is a sectional view on the line 3--3 of Figure 2 looking in the direction of the arrows.

Figure 4 is a sectional view on the line 4-4 of Figure 2 looking in the direction of the arrows.

Similar reference characters indicate corresponding parts throughout the several views in the drawings. i

, 2 p Referring te the drawings in detail A designates generally the electro-inertia brake construction in accordance with the invention and hereinafter set forth. The brake A comprises a hydraulic cylinder IB, having as usual interiorly thereof the uid actuated means II for the operation of the brake band, only the ends I2 thereof being shown in Figure 1 of the drawings, for coactlon with the brake drum I3 which is as is common a part of a vehicle wheel not shown The cylinder Il receives its uid supply from a feed conduit, a portion thereof being indicated at I l, which is part of a hydraulic braking system, the standard equipment in modern day motor vehicle. Arranged within the brake drum i3 is a small electric generator I5 comprising iield coils lia and poles I5b, which,is operated by the vehicle wheel,

and having in its current circuit I6 an electromagnet I1, and a manually operated switch Il,

respectively. The switch Il through connections I9 is controlled by a foot or hand brake pedal 2l which is properly located within the vehicle for manual operation in the actuation of the hydraulic braking system installation therefor.

Immediately below the cylinder il is an activating cylinder 2l having a volume displacing 28 of the magnet I1, and also mounted at the lower free end of the said lever is an inertia weight 29. The cylinder 2l has attached thereto a spring 30 which is also attached to the'lever 25, the spring 30 being for the purpose of maintainingV placement of the said lever with relation to the plunger 22, and the disposition of such spring with respect to the weight 29 assures more leverage.

The cylinders Ill and 2l, as well as the magnet Il are suitably xed to the stationary part of the brake I3', while the movable 'part of the latter is in association with the wheel of the vehicle as usual.

The plunger 22 is provided with a shoulder 3i which prevents the said plunger from being forced out of the cylinder '2i should the ,said plunger escape the lever 25 due to faulty opere.- tion of the-mechanism.

The parts of the mechanism are in a compact 3 arrangement with respect to the brake band I2 and the ,drum Il foreach wheel of the vehicle.

The electro-inertia brake is especially designed for use in connection with hydraulic braking syS- tems and as before set forth comprises a small 5 generator I 5 mounted in and operated bythe wheel of a vehicle 'to furnish current for energizing an electro-magnet I1. 'I'he armature 28 'of the magnet I1 is mounted to operate a lever gizing the magnet I'I and causing the weighted 20 lever 25 to be held against movement. The upper end of the weighted lever 25, abover the pivotal f point 26, is operatively connected with the valve 24 which isinterposed in the conduit I4 leading from the master brake cylinder to the brake op- 25 erating cylinder III in the wheel drum I3. When the magnet I1 is energized this valve 24 is in its fully open position. As the wheel comes to a stop, due to operation of the brake pedal byva driver of the vehicle, the generator I5` is slowed to a 3o point where the magnet I'I is no longer energized to hold the weighted lever 2l and due to inertia the lever swings away from the magnet I1, releasing the plunger 22 in the auxiliary cylinder 2I which moves outwardly under the pres- 35 sure oi' uid and is displaced by the fluid from the brake operating iluid thereby reducing the brake pressure to sulcient extent as to prevent -f locking oi' the wheel. At the same time the upper end of the weighted lever 25 closes the valve 24 4o in the conduit I4 leading from the master cylinder. Full braking power is thus permitted up to the point of locking the wheel but without reaching such locking p oint and skidding is thus prevented. The foregoing arrangement applies to each wheel of the vehicle. 'f

What is claimed is: i l. An electro-inertia brake system, comprising a hydraulic brake, a brake .'pedal controlling said brake', a vehicle wheel actuated electric genera- 50 tor, a hydraulic cylinder operating said brake, an activating cylinder in communication with said hydraulic cylinder and having a volume displacing plunger within the same, a switch controlled by said brake pedalior controlling the circuit of said generator, an inertia operated pivoted weighted lever adapted for contact with said plunger for controlling the Aaction o! said brake,

operated lever.

2. An electro-inertia brake system,compri`sing a hydraulic brake, a brake pedal controlling said vbrake', a vehicle wheel actuated electric generator, a hydraulic cylinder operating` said brake, an activating cylinder in communication with said hydraulic cylinder and havingy a volume displacv said generator, an inertia operated pivoted weighted lever adapted for contact with said plunger for controlling the iluid in the brake system when said brake pedal is actuated, a valve in the brake system and operatively connected with said lever, and an electro-magnet controlled by said generator and regulating the activity of said lever. f y l 3. An electro-inertia brakesystem, comprising a hydraulic brake, a brake pedal controlling said brake. a vehicle wheel actuated electric generator, a hydraulic cylinder operating said brake, an activating cylinder in communication with said hydraulic cylinder and having 'a volume displacing plunger within the same, a switch controlled by said brake pedal for controlling the circuit oi f said generator, an inertia operated pivoted weighted' lever adapted for contact with said plunger for controlling the iluid in the brake system when said brake pedal is actuated, a valve in the brake system and operatively connected with said lever, an electro-magnet controlled by said generator and regulating the activity of said lever, and' spring means associated with said lever to maintain it in contact with said plunger.

4. An electro-inertia brake system, comprising a hydraulic brake, a brake pedal controlling said brake, a vehicle wheel actuated electric generator, a hydraulic cylinder operating said'brake, an activating cylinder in communication with 4said hydraulic cylinder and having a volume displacing plunger within the same, a switch controlled by said brake pedal for controlling the circuit of said generator, an inertia operated .pivoted tem when said brake pedal is actuated, a valve in the brake system adapted to be actuated by said lever, an electro-magnet controlled by said generator and regulating the activity of said lever, and means associated with said lever to maintain it in contact with said plunger, said activating cylinder acting to maintain the brake system, plunger and lever in co'operative working relation with each other. e l ALOUIS E. JOHNSON. 

